*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
li{
    list-style: none;
}
a{
    display:inline-block;
}
.bk{
    height: 60px;
    padding: 13px 6px;
    background: dodgerblue;
    margin-bottom: 40px;
}
.header .header-top {
    margin: 0 auto;
    width: 65%;
    text-align: center;
}
.header-top a{
    text-decoration: none;
    color: white;
    font-size: 20px;
    text-align: center;
    float: left;
}
.header-top a img{
    vertical-align: top!important;
}
.header-top input{
    width: 50%;
    height: 35px;
    line-height: 35px;
    outline: none;
    font-size: 17px;
    padding: 5px 10px 3px 10px;
    border: none;
    margin-right: 10px;
    position: relative;
}
.zzc{
    width: 27.7%;
    height: 35px;
    background: dodgerblue;
    opacity: 0.6;
    position: absolute;
    top: 13px;
    left: 34.6%;
}
.header-top:hover .zzc{
    display: none;

}
.header-top button{
    height: 35px;
    line-height: 35px;
    width: 4%;
    border: none;
    font-size: 16px;
    background: white;
    position: absolute;
}
.main-st{
    width: 60%;
    margin: 0 auto;
}
.st ul li{
    padding: 10px 20px;
    border-bottom: 1px solid dodgerblue;
}
#list span{
    font-size: 16px;
}
#list button{
    font-size: 15px;
    border: 1px solid dodgerblue;
    background: white;
    padding: 3px 6px;
    float: right;
    outline: none;
}
#list button:hover{
    border-radius: 20px 0px;
    transition: 1s;
}
.a{
    width: 15%;
}
.b{
    width: 85%;
}
.a:before{
    content: "";
    display: block;
    clear: both;
}